Distasteful joke

[Seafront Plodder]

Baby Balloon can't get to sleep, so he wanders into his parents'
bedroom to get in bed with them. Only problem is, there's not enough
room for him to squeeze in between them.

So he goes round to Daddy Balloon's side of the bed, undoes his knot
and lets a little bit of air out. No good though; he still can't get
in.

He then goes round to Mummy Balloon's side of the bed, undoes her knot
and lets a little bit of air out. No good either; he still can't
squeeze in between them.

So he undoes his own knot and lets a bit of air out, and finally
manages to snuggle into the middle of the bed.

Soon, Daddy Balloon wakes up, and he's not happy. Waking Mummy and
Baby Balloon up, he proceeds to chastise the youngster:

"I've told you about this, son. You've got to sleep in your own bed.
You're a big boy now. You promised us it wouldn't happen any more. You
PROMISED us! You know what bothers me the most?........."

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"..... It's the fact that you've let me down, you've let your mum down
and worst of all, you've let yourself down."